1) The car controls will move forwards and backwards through MP3 music on the phone. However it doesn't seem to control Spotify. I notice that the current MP3 app is toggled as the default for bluetooth headset controls. Will spotify work if I disable the default app?

2) If I change to any other input on the car stereo, for example CD or FM, then I still receive calls through the car ... but the phone's notifications are silent as they are all piped through Bluetooth, which I can't hear as it's no longer the input I'm listening to. Is there any way to say "When connected via bluetooth, still alert me via the phone for SMS and email messages?"